Prismatic-glass reflector.



v PATENTED MAY 22,1906.

0. A. MYGATT. PRI-SMATIG GLASS REFLECTOR.

APPLICATION FILED JAN.11, 1906.

. stantially free from deterioration by the ac- J Uni Tun sTA'rEs PATENT omen.

OTIS-A. MYGATT, or NEW YORK, N. Y. PRlSM ATl C-G LASS REFLECTOR.

. Specification of Letters Patent.

Patented May 22, 1906.

Application filed January I1 1906. Serial No. 295,667-

. To' alll whom it may concern:

Be it known that I, OTIS A. MYGATT, "a citizen of the United States, residing at New York, in the county of New York and State of New Yorlr,'haye invented certain new and useful Improvements in Prismatic Glass Reflectors, ofwhich the following is a specification of such reflectors with artificial lights-in.

a peculiar manner.

The object of the invention is to produce a reflector of prismatic glass which shall be subcumulation of dust and which may be availl -more brilliant-and of less cost.

able for use either with a single light or with a cluster of lights and with or without auxiliary reflectors.

' Reflectors composed of prismatic glass are well known and have many advantages over metallic reflectors in that they are usually principal objections to a' reflector of prismatic glass, however, is that when dustaccumulates on the prismatic surface thereof it can- 'on does not diminish the reflecting power of the reflector. I

Figure 1 is a side elevation of a reflector according to this invention arranged with, re-

lation to a cluster of incandescent electric lamps. Fig. 2 is a partial elevation and partial section of a similar reflector with incandescent lamps and attachments arranged in auxiliary reflectors.

different relation thereto, some lamps having Fig. 3 is a cross-section on line 3 3, Fig. 1.

In my Patent No. 763,689, of June-28, 1904,

I show and describe a reflector composed of prismatic glass and having its reflecting-prisms disposed on the exterior of'the frustum of a set forth in said patent. In the present invention' the light-reflecting prisms are arranged in the interior of a frusto-conical or approximately such shaped body instead of on the exterior, as in the patent referred to.

One of the The prisms are of the general character of the reflecting-prisms described insaid patent; but being in the interior instead of on the exterior of a curve the reflector-prisms have a tendency to diffuse rather than to concentrate rays of light. The letter A represents a body of-clear glass, usually made by pressurein a mold. The outer surface of this body is smooth and preferably fire polished. The body shown is a modification of the conic frustuni with the base at the upper end.. The convex outer surface is smooth. The interior or concave surface of the body A is substantially covered with light-reflecting prisnis B. These prisms are of the general character of reflectingprisms described in said patent.

When the reflector is used for a cluster of lights, it is suspended, as shown inFigs. l and .1 covered by the flared portion of the reflector.

The dust which accumulates on the upper surface of the prisms B does not interfere with their reflecting power. Dust will not accumulate to' a great extent on the lower or convex surface of body A, and what does so aceumulate is readily accessible and may be wipedaway. The lightsC are largely protected against dust by the overhang of the flared portion of the reflector. Some rays of light will be thrown from the filament of lamp 0 and will be reflected at b insubstann tially the direction indicated toward 0; but go as the reflecting-prisms are inside the body A. there will be a tendency todifluse the rays, as indicated at a b b Fig.3.. The same will be true of rays which reach other parts of the reflecting-surface, as at'd e f. 1; 5

Instead of arranging the cluster of lights below the end of reflector A these can be arranged near the upper part thereof, as at D D. In such case a small reflector E is preferably arranged aboveeach lamp D. Some of the light-rays from me lamp D will then reach the reflector Aby direct radiationsay on the line it '-and be reflected toward 7c, and some rays will be reflected by reflector E to the reflector A and thence reflected and radiated,(see'line r05 Zmn0,Fig. 2.)

The reflector A may be used with a single lamp, as well as with a cluster. Thus la np H, Fig. 2, will cast sonic rays in the direction p g, and such rays will be directed in the genrm eral direction 1', Fig. 2. p

The reflector A illustrated is in the form of a, rrustum of a conical body drawn in toward smooth outer surface,

its central portion. This is not av necessary, although a preferred, form of construction. Trjessential ideaof my invention is that the '1(2fl(7i1111g"pI'1SmS B shalL-be on the interior su rtece or the reflector and that the reflected rays sh all be d rected outwardly from the cur- What I claim ;is 1. The combination with an artificial light outside the reflector, ot a reflector of prisematic glass in form of a frustum, having reflecting-prisms on its interior surface, and heaving its flared end overhanging the light.

2. The combination with a cluster of ele trio lamps, of a reflector in form of e frustum surrounding a common center of the cluster, soid reflector being composed of glass with a OTIS A. MYGATT.

Witnesses:

' H. E. NASON, l E. FER-ms BROWN. 

